The HM509H8908 9-Gallon Model includes a manual humidistat Control. The unit draws 10 Amps and a dedicated power supply is recommended..

About the Manual Control:The H8908 humidistat is your basic, bare bones control. It's advantages are simplified control and low cost. It closes the humification circuit manually whent he humidity drops in the home. This humidistat will not provide any automatic control based on outdoor temperature. It can be mounted on the wall or on the return air ductwork.

KEY BENEFITS:

TrueSTEAM works by producing its own steam independent of equipment operation, so your home gets moisture when you need it most.

TrueSTEAM is the most eco-friendly way to humidify your home, because it uses up to 70 percent less water while delivering more moisture than traditional whole-house humidifiers.

While other humidifiers rely on moisture-filled pads that can be susceptible to bacteria growth in the water and the airstream, TrueSTEAM delivers "true" steam - the cleanest form of humidification.

In addition to keeping your home and family comfortable, TrueSTEAM can help reduce heating bills. Because humidified air feels warmer, you'll be able to turn your thermostat down for savings.

Easy maintenance - Self-regulates cleaning cycles throughout the year. Annual maintenance requires no tools to access and clean, saving time and money on annual contractor service calls. In-line water filter for scale and sediment also provided.

Application flexibility - Mount directly to the duct or remotely (with optional remote install kit) up to 20 feet away into tight-fitting or unconditioned air spaces.

Excellent product that works as advertised. Install took the better part of a day, but I had to use the remote install kit as the humidifier is mounted in a very small town home utility closet. Paired with the Honeywell Prestige HD thermostat the humidifier keeps the house at a comfortable 40% relative humidity regardless of what the humidity is outside. Best home purchase we have ever made and should have gotten this unit years ago.

I bought this at the same time as the Honeywell IAQ thermostat (YTH9421C1002). I love being able to humidify the whole house without any filling of water or filter/media changes. I'm an amateur at HVAC, but I love to DIY. The hardest part was find a spot where I could mount this above my airhandler. The directions say to mount it downstream. Luckily there was a picture which told me that they meant it should be in a section where air has left your furnace/AC and is heading to the house. This thing flushes itself regularly and drains itself if it isn't used for 48 hours. It looks like you just have to clean the tank annually, and the tank is a piece of cake to remove.It took the unit about 18 hours of constant operation to bring the humidity from 31% to 45%, but since then the humidity has held just fine. This is in a 1800 sq ft house on 3 floors.

The HM509H8908 9-Gallon Model includes a manual humidistat Control. The unit draws 10 Amps and a dedicated power supply is recommended..

About the Manual Control:The H8908 humidistat is your basic, bare bones control. It's advantages are simplified control and low cost. It closes the humification circuit manually whent he humidity drops in the home. This humidistat will not provide any automatic control based on outdoor temperature. It can be mounted on the wall or on the return air ductwork.

KEY BENEFITS:

TrueSTEAM works by producing its own steam independent of equipment operation, so your home gets moisture when you need it most.

TrueSTEAM is the most eco-friendly way to humidify your home, because it uses up to 70 percent less water while delivering more moisture than traditional whole-house humidifiers.

While other humidifiers rely on moisture-filled pads that can be susceptible to bacteria growth in the water and the airstream, TrueSTEAM delivers "true" steam - the cleanest form of humidification.

In addition to keeping your home and family comfortable, TrueSTEAM can help reduce heating bills. Because humidified air feels warmer, you'll be able to turn your thermostat down for savings.

Easy maintenance - Self-regulates cleaning cycles throughout the year. Annual maintenance requires no tools to access and clean, saving time and money on annual contractor service calls. In-line water filter for scale and sediment also provided.

Application flexibility - Mount directly to the duct or remotely (with optional remote install kit) up to 20 feet away into tight-fitting or unconditioned air spaces.